The students in our school are encouraged to _______ their own opinions about any school rules and require the authority to give them reasonable explanation, which is helpful to develop their critical thinking.
| A．draw | B．voice | C．spin | D．polish |
_____ still half drunk, he made his way home.
| A．When | B．Because | C．Though | D．As |
_____ she was very tired, she went on working.
| A．As | B．Although | C．Even | D．In spite of |
Busy _____ he was, he tried his best to help you.
| A．as | B．when | C．since | D．for |
I learned a little Russian _____ I was at middle school.
| A．though | B．although | C．as if | D．when |
_____ we got to the station, the train had left already.
| A．If | B．Unless | C．Since | D．When |